Summary: With the spread of omicron exacerbating staffing shortages, returning to school after winter break has been a significant struggle in many parts of the country. The overwhelming number of districts are back in person, but some have gone virtual for a few weeks. And, as Stephanie Sy reports, the biggest battle over whether to return to in-person learning has been playing out in Chicago. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders
